Physics Waves UHS 2023
PMDC Verified Question 30 of 125
When a wave goes from one medium to another, there is a no change in the:
A
Frequency
B
Amplitude
C
Wavelength
D
Velocity
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Frequency
Concept:

A wave's properties are split between source-dependent factors and medium-dependent factors.

Solution:

  • Frequency is exclusively determined by the original source creating the oscillation. The number of cycles pushing against the boundary per second must equal the number of cycles propagating away into the new medium. Therefore, frequency never changes.


  • Velocity changes because different media have different restoring forces (elasticity/density).


  • Wavelength must change proportionally (\( \lambda = v/f \)) to accommodate the new velocity while keeping frequency constant.


Why other options are incorrect:

Wavelength and velocity adapt to the new medium. Amplitude decreases due to some energy reflecting off the boundary.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

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